Animal containment system

ABSTRACT

An animal containment system comprising a stationary transmitter including a transmitter for defining a first curtain of energy having a first code to be entered by an animal approaching an off limits area and a second curtain of energy adjacent the first curtain and having a second code, the second curtain to be entered after the animal passes through the first curtain approaching the off limits area, and at least one receiver to be carried by an animal to be contained including a receiver responsive to the first code when the animal is within the first curtain for issuing a warning signal and responsive to the second code when the animal is within the Second curtain for issuing a discipline signal.

The present application is a continuation-in-part of Ser. No. 126,325, filed Sep. 24, 1993, abandoned, which was a continuation-in-part of Ser. No. 08/014,810, filed Feb. 8, 1993, now U.S. Pat. No. 5,335,626, which was a continuation of 07/867,892, filed Apr. 13, 1992, abandoned, which was a continuation-in-part of Ser. No. 07/094,075, filed on Sep. 4, 1987, now U.S. Pat. No. 5,113,962, which was a continuation of Ser. No. 06/820,644, filed on Jan. 21, 1986, abandoned.

An animal containment system is disclosed which is a static electronic energy conversion device consisting of two parts, a transmitter part and a receiver part. Being static, it contains no moving parts. A linear energy field of coded energy which may be viewed as a plane or curtain of energy, is transmitted along a linear corridor. The width, length, and even the curvature of this energy curtain may be adjusted to meet specific applications. The energy transmitted in this manner may be received by a receiver located anywhere within the curtain (plane). The strength of the energy will decrease in intensity as the energy field extends from the focal line of the curtain.

Encoded, superimposed or integrated within the energy curtain is a communication signal, which may be a frequency, pulses, modulated frequency, modulated amplitude, etc. The complementary receiver part located anywhere within the curtain (plane) of the transmitted energy will receive the energy, and decode the encoded signal. In this fashion communication will occur between the transmitter(s) and any receiver carried by an animal located within the curtain (plane).

Other objects and advantages of the present invention will become apparent from the following portion of the specification and from the following drawings which illustrate in accordance with the mandate of the patent statues presently preferred embodiment incorporating the principles of the invention.

Referring to the drawings:

FIG. 1 is a side view of the animal containment system made in accordance with the teachings of the present invention,

FIG. 2 is front view of the animal containment system shown in FIG. 1,

FIG. 3 is a block diagram illustrating the transmitter of the animal containment system,

FIG. 4 is a block diagram illustrating the receiver of the animal containment system,

FIG. 5 is a block diagram of a transmitter for transmitting infrared optical energy,

FIG. 6 is a block diagram of a receiver for receiving infrared optical energy,

FIG. 7 is a side view using array optics to define a single energy curtain

FIG. 8 is an overhead view of the system shown in FIG. 7,

FIG. 9 is a front view of an animal containment system showing the overlapping of two linear energy curtains,

FIG. 10 is a block diagram illustrating the transmission of infrared optical energy where the wave length is the code,

FIG. 11 is a front view of an animal containment system establishing two overlapping energy curtains with the use of refractive optics,

FIG. 12 is a similar view using reflective optics,

FIG. 13 is a similar view using a first embodiment of masking optics,

FIG. 14 is a view similar to that of FIG. 11 illustrating a second embodiment of masking optics,

FIG. 15 is a view similar to that of FIG. 14 illustrating a third embodiment of masking optics,

FIG. 16 is an electronic diagram illustrating a transmitter having a preferred embodiment, and

FIG. 17 is an electronic diagram illustrating a receiver having a preferred embodiment, and

FIG. 18 is an electronic diagram illustrating a training device made in accordance with the teachings of the present invention.

An application example would consist of one or more stationary transmitters62 as shown in FIGS. 1 and 2. The transmitters 62 send a linear curtain of energy (decreasing in intensity from the focal line) 63, encoded with a command along a boundary or perimeter. A moving or fixed receiver 65 attached to a conveyance 64, such as a domesticated animal to be contained, receives and converts the linear energy back into an electronicsignal decoded to present information. The beam 63 extends a curtain along a border or boundary. The transmitter(s) can be mounted on suitable posts (for outdoor applications) or walls (for indoor applications) 80. The animal will be in continual communication with the transmitter (the animalwears a collar 70 which presents one or more receivers) so long as the animal is within the curtain of the transmitted linear energy beam. The communication occurs with no physical connection or wiring between the transmitter 62 and the animal 64.

Referring to FIG. 3, the block diagram of the transmitter 62, the communication signal 1 contains the information which is to be transmittedthrough the transmitter 62. This communication signal is integrated with the electronic signal generator 2 which results in an electronic encoded signal 3. This electronic encoded signal drives the energy converter 4, which generates a point source of encoded energy 5; this encoded energy immediately begins to disperse omni-directionally from its point source. It is now intercepted by the linear converter 6, which focuses the rapidlydispersing energy into a narrow line of encoded energy which may be directed along a prescribed curtain 7. A receiving device 65 either movingor stationary within the curtain of energy may now detect the encoded energy. This will only occur within the energy curtain. The block diagram of the receiving device, shown in FIG. 4, includes an energy concentrator 8 which will focus the linear energy into a point source 9. The point source of energy is focused onto an electronic converter 10 which convertsthe energy into an encoded electronic signal 11. The electronic filter and comparator 12 rejects unwanted signals and converts low level received signals to logic level signals. Upon recognizing the specified signal the signal is decoded by the communication signal decoder 13, and is transferred out to the conveyance (animal) controller, 14. The conveyance controller will convert the signal into an instructional command to the animal. This instructional command may take several forms, such as varyingaudible tones, electrical shock, or other instructional instruments.

The energy utilized can be anywhere within the frequency spectrum which could include, but is not limited to, audio, visible light, laser light, infrared, microwave, etc. Certain energy frequencies are better suited forindividual applications. Near infrared optical energy (800 to 1000 nanometers) is very well suited for this environment. An infrared transmitting application is shown in FIG. 5. The incoming data signal is conditioned through a signal conditioner 15, and allowed to pass through "and" gate 18 only when enabled by an external signal (switch). The data signal 19 enables the higher frequency signal 17 which was generated by the frequency oscillator 16. Data pulses of encoded frequency 21 which issue from gate 20 enter the current driver 22, which provides the encodedelectrical signal 23 of sufficient current to drive the infrared emitting diode 24. This provides sufficient current to generate the infrared energypulses 25 corresponding to the encoded electrical signal. These infrared data pulses enter the cylindrical lens 26 which converts the omni-directional energy pulses into linear energy pulses 27. The linear energy pulses are transmitted along the direction of a defined corridor.

The infrared receiver shown in FIG. 6 may be either moving or stationary within the corridor, and receives the linear energy pulses 27. The lens 28focuses the linear energy onto the infrared receiving diode 29. This then generates an electrical signal 30 of the encoded data. The encoded electrical signal is amplified by the operational amplifier 31 into a useable electrical signal 32 which enters the decoding circuit 33, which is synchronized to the originally generated and transmitted frequency fromthe frequency oscillator 16. This circuit results in decoded pulses 36 which correspond to the original data from the signal generator 15. These decoded data pulses are conditioned by a signal conditioner 34, and the conditioned pulses 35 are converted into instructional commands to the animal. The linear energy curtain may be applied to contain animals withina prescribed boundary. This includes keeping the animals away from restricted zones. This would form a continuous curtain of invisible linearenergy at a perimeter or boundary. Any linear energy receiver entering the curtain (corridor) of the linear energy would be subject to the instructional command. The linear energy curtain would transmit a continuous signal within its curtain.

As shown in FIGS. 7 and 8, a curtain could be defined by a linear array of point sources in the form of LED devices 82. Each LED 82 emits energy substantially in the form of a cone 101 which defines an angle about its axis. By tilting the LED's these conical energy cones can be overlapped todefine the desired vertical wall or curtain 102.

Two curtains 66, 68 could be transmitted side by side and possibly overlapping defining a third curtain having both codes to provide different instructional commands to the animal. This is shown in FIG. 9. In this configuration two linear energy transmitters would be employed to transmit two different energy curtains containing two different codes. Thereceiver located on the conveyance (animal) would be capable of receiving and decoding both codes. As the animal entered the first curtain 66, this signal would be decoded, and the appropriate instructional command (an audible tone, for example) issued to the animal. As the animal entered theoverlapping curtains corridor 67, two codes would be received and decoded. The animal would receive a second and,perhaps different instructional command. As the animal proceeded to the corridor occupied solely by the second curtain 68, the animal would then receive an additional instructional command (an electrical shock, for example). The instructional commands would be selected to best deter the animal from entering and going through the boundary. Having the two curtains adjacent but not overlapping simplifies the electronics since only one code will bepresent in each curtain.

In a similar manner, a plurality of transmitters and linear energy curtainsmay be employed to provide a plurality of instructional commands.

The electronics within the receiver would be capable of receiving all the signals provided by the transmitters and subsequently converting these signals into the desired instructional commands. The instructional commands therefore would vary depending upon the relative position of the receiver (animal) to the boundary established by the linear energy curtains.

Most types of radiated energy can be utilized for this function. However, near infrared energy offers a very safe and practical frequency range for this specific requirement. Electronic signals are generated which contain the code to be transmitted. These electronic signals are converted to infrared utilizing electronic devices manufactured for the purpose. The infrared energy generated begins to disperse until it contacts the cylindrical optical lens which linearizes the energy into line which disperses into a plane or curtain. The shape and size of the curtain is established by design. The infrared energy curtain is focused onto a prescribed boundary, thus generating the linear energy only where desired.Any receiving device within the curtain only may receive the coded energy signals. These signals are decoded to provide an instructional command to the animal, warning it to remain within the prescribed boundary. This provides a new and unique method of establishing perimeter for animal control.

In addition to encoded infrared transmitted signals, the basic infrared optical energy could also be utilized as a means for establishing an invisible curtain as shown in FIG. 10. The absence and presence of the infrared energy of a specific wavelength (the code) could be detected by the receiver on the collar as an indication that the animal is within the invisible curtain field, and a subsequent instructional command could be issued to the animal.

The intensity of the field decreases as the field disperses from the lens, 26. Optionally, circuitry in the collar could be devised which would sensethe change in field strength as the animal moves into and through the fieldtowards the boundary. This change in magnitude of the field strength would be detected and an appropriate instructional command could be issued to the animal in direct relationship to the magnitude of the field strength. Multiple fields could be transmitted utilizing multiple circuitry. Each field would have unique data characteristics.

For the infrared field of FIG. 10, where the frequency is the code, a second infrared field of different wavelength from the first would be transmitted. This second infrared field would be of a unique infrared wavelength from the first field. A second circuit would transmit through adifferent infrared emitting diode 24, which would transmit a different infrared wavelength through the same or separate optics 26. The receiving collar would have circuitry and optics included which would detect both ofthe unique infrared energy fields and be capable of distinguishing between the two. An appropriate instructional command would be issued to the animal for each of the fields that it enters. Likewise, a plurality of fields may be transmitted and received.

The contour of this energy and the resulting projections may be establishedas discussed below.

Refraction Optics

Referring to FIG. 11, the infrared energy generated within transmitter 81 by the point energy sources 82 begins to disperse until it contacts the cylindrical optical lens 83 (shown in edge view) which linearizes the conically shaped (omnidirectional) energy from each point source into a wedge which disperses into a plane or curtain. The shape and size of the curtain is established by design of the length and focal length of the lens. The length, width, and overlap of the energy are established by design, and are established into two or three separate zones. The zones are defined as 85--the first warning zone, 86--a second optional warning zone and 87--the correctional zone. The infrared energy curtain is focusedonto a prescribed boundary, thus generating the linear energy only where desired.

Reflection Optics

Referring to FIG. 12, the infrared energy generated within transmitter 81 by a point energy source 82 begins to disperse until it contacts the reflective mirror 93 (shown in edge view) which focuses or linearizes the energy from a conical shape into a wedge which disperses into a plane or curtain. The shape and size of the curtain is established by design of thelength and focal length of the mirror. The length, width, and overlap of the energy are established by design, and are established into three separate zones. The zones are defined as 85--the first warning zone, 86--an optional second warning zone and 87--the correctional zone. The infrared energy curtain is focused onto a prescribed boundary, thus generating the linear energy only where desired.

Masking Optics

Referring to FIG. 13, the infrared energy generated within each transmitter81 by a point energy source 82 begins to disperse until it contacts the mask 100, (shown in edge view) which masks the conical shape of the energyso that further dispersion is in the form of a substantially rectangular wedge which disperses into a plane or curtain. In the embodiment shown in FIG. 13, each mask 100 has an inner portion 100A which truncates one side of the conical energy form and has an outer portion 100B which truncates the opposite side of the conical energy form. A curtain which is substantially rectangular in cross section is thereby defined. By so masking the two sources, the curtains 85, 87 containing the warning and instructional commands can be separated and if desired, a third intermediate curtain 86 having both codes can be defined. The shape and size of the curtain is established by the geometrical design of the length, width and placement of the point energy sources 82 within the mask. The length, width and overlap of the energy are established by design and are established into three separate zones. The zones are defined as 85--the first warning zone, 86--a second warning zone and 87--the correctional zone. The infrared energy curtain is masked to establish a prescribed boundary, thus generating the linear energy only where desired.

A second masking embodiment is shown in FIG. 14. Here the masking is external in the form of a closed box 110 having a slit 112 formed so that warning 86 and instructional 88 curtains are separated by a third curtain 87 containing both codes. In FIG. 15 the box 104 is made from a transparent material such as clear plastic and an internal mask having an outwardly projecting portion 106 and a transverse portion 108 at the outerend thereof is used to define adjacent, separated warning and instructionalcurtains. This embodiment is ideally suited to project the curtains from the side, as would be the case if the housing included a universal joint connection 110 to a supporting piece 112, which could be inserted into a wall plug 114 to provide the required power. By reducing the width of the transverse portion and, if necessary, shortening the outwardly projecting portion, a third (two code curtain) could be defined between the warning and instructional curtains.

The transmitter circuit shown in FIG. 16 is comprised of three circuit sections.

Section 1

The first section limits the input power voltage, filters the input voltageand rectifies the input voltage. It also contains two visible light LED's, one red and one yellow, which are located in the assembly advanced to the LED's generating one curtain. This will give guidance to the installer adjusting the mounting of the transmitter. This first circuit is comprisedof four diodes, one capacitor, two LED's and one Zener diode.

Section 2

The second circuit section is a standard oscillator which turns on a power FET to enable high current pulses 22 microseconds wide with a repetition rate of 250 Hz to pass through a number of series connected infrared emitting diodes 120. While two are shown, three or more may be preferable.The emissions from these diodes form the infrared warning signal and establish through its packaging the area in which the receiving device on the collar will cause the receiver's buzzer to sound continuously.

Section 3

Circuit section three is identical to section two except that the timing components on the oscillator result in an output pulse that causes its infrared emitters 120 to be on for 11 microseconds with a repetition rate of 1000 Hz. When this signal is received by the collar it will result in the animal receiving a disciplinary action.

The receiver circuit shown in FIG. 17, which is mounted in the dog collar assembly, is comprised of six basic sections.

Section 1

Section 1 is comprised of two spaced sets of infrared receiving diodes witheach set containing typically three infrared diodes connected in parallel. These diodes which are visible light filtered and have a built-in wide angle lens may be disposed to accept energy from opposite aspects of the conveyance and may be tilted to better cover a variety of angles for receiving the coded energy.

Section 2

Section 2 is comprised of two identical RC circuits which reduce current consumption when the receiver is not within a coded infrared energy zone. This RC circuit acts as a current limiting, very high impedence to DC or low frequency infrared energy that might be received in non-coded form such as sunlight or 60 HZ infrared from artificial lighting. It is comprised of two identical highpass RC filter circuits 122 (one filter circuit for each set of receiving diodes) and signal threshold detection logic. The filters use passive components to perform the functions of a first order high-pass filter. The purpose of these filters is to eliminatethe 60 Hz and 120 Hz sinusoidal infrared components associated with ambientindoor lighting. These two filters are preceded in the circuit by a resistor 124 which is in series with the infrared receiver diodes and ground. This resistor provides a current path across which to generate a voltage which is representative of the intensity of the input infrared signal. The two signals that are used for detection are as follows. The warning zone signal is a 22 microsecond pulse which occurs at a repetitionfrequency of 250 Hz. The discipline or shock signal is detected by the reception in the receiving diodes of a signal that is a 11 microsecond pulse which occurs at a repetition rate of 1000 Hz. The RC filter should actively pass the legitimate warning and discipline signals with minimal attenuation because their virtually square wave shape causes them to appear as the timing equivalent of a high frequency sine wave (approximately 18000 Hz). The outputs of these first order filters are putinto comparators 126 and when the infrared signal exceeds the predeterminedthreshold established for the comparator by resistors 128 the output of thecomparators goes low. The two outputs of the comparators are connected so that if a signal is detected at either one it will be passed onto the nextcircuitry section as a logic low signal level for roughly 22 microseconds (warning) or 11 microseconds (discipline). Essentially, the comparators convert a very low level input event to typical logic levels for processing by subsequent electronics and hence, function as a signal conditioner set to the very low threshold at which the output of the receiving LED's are supplied to the rest of the circuitry. The comparator is extremely sensitive and can detect very weak signals.

Section 3

Section 3 is comprised of two frequency range detectors. It is comprised oftwo structurally identical digital filter circuits with different timing components. Each digital filter circuit is comprised of successive one shots 130 followed by an RC smoother or integrator and a comparator 126. The digital filter circuit which has a bandpass of from 125 to 703 Hz willonly detect the presence of a warning signal. The warning signal will be detected even where asynchronous warning signals are simultaneously received from two different transmitters. The digital filter circuit whichhas a bandpass of from 794 Hz to 15,873 Hz will detect the presence of a discipline signal and will detect that signal even where asynchronous disipline and warning signals are simultaneously received from two different transmitters.

Each digital filter functions in two stages. If the input frequency is sufficiently high to retrigger the first stage before it times out, its output will always remain high and not allow the input pulse to be transmitted on to the next stage. Thus the first stage eliminates frequencies above the desired pulse rate to be detected. The second stage of each filter is also a one shot whose output will go low if the repetition rate at its input is not high enough to retrigger it prior to it timing out. Each succeeding circuit with the diode assures that spurious events are rejected and when coupled with the comparator will indicate by the comparator output going low that the input signal falls within the acceptable frequency band and represents a legitimate warning or instructional signal. The diode causes the integrator discharge time constant to be shorter than the charge time constant.

Section 4

This section is comprised of a transistor 132 enabled sounder 134 which provides a continuous warning tone whenever the warning zone is occupied. The preferred sounder which is sold by Intervox (P/N BRT1209P-06-C) will operate when a voltage in excess of 4.5 volts is applied. This sounder is enabled when the output of the warning zone digital filter (comparator 126) is low.

Section 5

Section 5 is comprised of an oscillator 138 which is enabled by the output of the digital filter which detects when the penetration of the disciplineor shock zone occurs. The output of the oscillator, a repetitive changing between high and low state, has two consequences. Diode 140 forces the output of the warning signal comparator 126 to correspond to the output ofthe oscillator 138. As a result, when the animal is in the discipline zone,the sounder 134 will-be operated in a noncontinuous (intermittent) manner, i.e., the sounder will have a repetitive cycle with each cycle including asounder on portion followed by a sounder off portion.

Section 6

Section 6 is comprised of a transistor 142 and a high turns ratio transformer 144 which will provide a high voltage but low energy shock, toa pair of animal engaging metal posts 146, at a rate which is controlled bythe oscillator 138. The power supply is a six volt battery 148. A 1.5 volt battery receiving receptacle 150 is present in the transistor 144 line which can: 1. be left open whenever it is desired that the instructional/discipline signal not issue when the animal is in the instructional zone (the sounder will however operate intermittently at theoscillator rate); 2. be filled with a 1.5 volt battery 152 whenever the system user desires to increase the strength of the instructional/discipline signal and 3. be filled with a current conductingslug 154 when the lower magnetude instructional signal is sufficient. Sincethe sounder will only operate at a voltage above 4.5 volts, when the battery voltage reduces to this level, the sounder will chirp instead of sounding to inform the system user that the battery needs replacing. When the voltage drops below this 4.5 volt level the sounder will be quiet whenthe animal is in either the instructional/discipline field or in the warning field and this also will serve as notice that the battery needs replacement.

While cats and dogs wearing a receiver can be contained with the use of either the transmitter, this same technology has applicability for containing another special animal, i.e., man. To contain a person, who sleep walks, in his or her bedroom, a wrist band carrying a receiver can be worn by the sleep walker. The sleep walker can program the receiver to emit both signals or just the warning or instruction signal, and can select from the two intensities of the instruction signal.

Additionally, children in some controlled environments may wear such a receiver on a hat or the like, so that their behavior can be impacted withthe use of the transmitter. Also in neighborhoods where fences are not permitted or desired this technology can be used to fence the child in.

A hand held training device to be used with an animal wearing a receiver, is illustrated in FIG. 18 The training device has two depressible buttons,one a warning button 160 and the other a discipline or instruction button 162. Pressing the warning press button 160 connects one resistor to the oscillator 166 circuit thereby operating a transistor 168 to apply the power from the battery 170 to the light emitting diode 172. The diode willemit the warning code. Pressing the discipline button 162 will connect a second resistor 174 and result in the discipline code being emitted from the light emitting diode. By aiming the light emitted from the light emitting diode at the animal the animal can be selectively warned or disciplined. 

We claim:
 1. An animal containment system comprisinga stationary transmitter includingmeans for defining a first curtain of energy having a first code to be entered by an animal approaching an off limits area and a second curtain of energy adjacent said first curtain and having a second code, said second curtain to be entered after the animal passes through said first curtain approaching the off limits area, and at least one receiver to be carried by an animal to be contained includingmeans responsive to said first code when the animal is within said first curtain for issuing a warning signal and responsive to said second code when the animal is within said second curtain for issuing a discipline signal.
 2. An animal containment system according to claim 1, wherein said defining means comprisesfirst light emitting means for emitting energy having said first code, and second light emitting diode means for emitting energy having said second code.
 3. An animal containment system according to claim 2, wherein said defining means further comprises lens means for focusing the energy emitted from said first and second light emitting diode means.
 4. An animal containment system according to claim 2, wherein said defining means further comprises reflector means for focusing the energy emitted from said first and second light emitting diode means.
 5. An animal containment system according to claim 2, further comprising masking means for preventing the energy emitted from said second light emitting diode means from entering said first curtain and for preventing the energy emitted from said first light emitting diode means from entering said second curtain.
 6. An animal containment system according to claim 5, wherein said masking means is selectively configured so that a third curtain containing both of said codes is located between said first and second curtains.
 7. An animal containment system according to claim 3, wherein said masking means comprises a planar wall intermediate said first and second light emitting diode means.
 8. An animal containment system according to claim 7, wherein said wall has a side facing the desired location of said curtains and a planar strip is secured along said side to extend transversely to be bisected by said wall.
 9. An animal containment system according to claim 8, wherein said masking means comprises a wall having a rectangular opening therein.
 10. An animal containment system according to claim 8, wherein said masking means comprisesa first mask pair for confining the energy emitted by said first light emitting diode means to a selected angle and a second mask pair for confining the energy emitted by said second light emitting diode means to a selected angle.
 11. An animal containment system according to claim 1, further comprising visible light source means having a first characteristic associated with one of said curtains and visible light source means having a second characteristic associated with said other curtain, for facilitating installation.
 12. An animal containment system according to claim 1, wherein said defining means comprises lens means.
 13. An animal containment system according to claim 1, wherein said defining means comprises reflector means.
 14. An animal containment system comprisinga stationary transmitter includingmeans for defining a curtain of coded near infrared energy to be entered by an animal approaching an off limits area and at least one receiver to be carried by an animal to be contained includingmeans responsive to said code when the animal is within said curtain for issuing a signal.
 15. An animal containment system according to claim 14, wherein said defining means comprisesat least one light emitting diode for emitting energy having said code.
 16. An animal containment system according to claim 15, wherein said defining means further comprises a lens for focusing the omni-directional light emitted by said at least one light emitting diode into said curtain.
 17. An minimal containment system according to claim 15, wherein said defining means further comprises a reflector for focusing the omni-directional light emitted by said at least one light diode into said curtain.
 18. An animal containment system according to claim 15, wherein said defining means further comprises means for selectively masking the omni-directional light emitted by said at least one light emitting diode so that said curtain will be defined.
 19. An animal containment system according to claim 14, comprising a pair of receivers for responding to energy incident on different aspects of the animal.
 20. An animal containment system comprisinga transmitter including means for defining a first curtain of coded energy which obeys the laws of reflection and refraction having a first code and for defining a second curtain of coded energy which obeys the laws of reflection and refraction having a second code, and a receiver to be carried by an animal including means responsive to said first code of said first curtain of coded energy for issuing a warning signal to the animal and means responsive to said second code of said second curtain of coded energy for issuing a discipline signal to the animal.
 21. An animal containment system according to claim 20, wherein said defining means comprises means for defining a curtain of coded energy which obeys the laws of reflection and refraction having a first code and means for defining a curtain of coded energy which obeys the laws of reflection and refraction having a second code, and said responsive means comprises means for issuing a warning signal to the animal responsive to said first code and means for issuing a discipline signal to the animal responsive to said second code.
 22. An animal containment system according to claim 21, wherein said transmitter is hand carried.
 23. An animal containment system according to claim 22, wherein said means for defining a curtain of coded energy which obeys the laws of reflection and refraction having a first code includes a first push button and wherein said means for defining a curtain of coded energy which obeys the laws of reflection and refraction having a second code includes a second push button. 